OPS型固化剂改良砂土工程特性试验研究  

Experimental study on engineering properties of sand reinforced by OPS soil stabilizer

作　　者：刘瑾[1] 白玉霞[1] 宋泽卓 陈志昊 孙少锐[1] 黄英豪[2] 王琼亚 魏继红[1] Liu Jin;Bai Yuxia;Song Zezhuo;Chen Zhihao;Sun Shaorui;Huang Yinghao;Wang Qiongya;Wei Jihong(School of Earth Sciences and Engineering,Hohai University,Nanjing 211100,China;Nanjing Hydraulic Research Institute,Institute of Geotechnical Engineering,Nanjing 210029,China)

机构地区：[1]河海大学地球科学与工程学院,南京211100 [2]南京水利科学研究院岩土工程研究所,南京210029

出　　处：《东南大学学报（自然科学版）》2019年第3期495-501,共7页Journal of Southeast University：Natural Science Edition

基　　金：国家自然科学基金面上资助项目(41472241);江苏省水利科技项目重大技术攻关资助项目(2017010)

摘　　要：为了研究有机高分子固化剂(OPS型固化剂)改良砂土效果,开展了渗透、抗压、快剪和抗拉试验,分析了OPS含量和砂土干密度对改良效果的影响,并结合微观扫描电镜对OPS改良砂土机理进行了深入研究.试验结果表明,随OPS含量和砂土干密度的增大,改良砂土的渗透系数逐渐减小,相对渗透阻力系数逐渐增大,抗压强度、残余强度和黏聚力均增强.内摩擦角随OPS含量增加呈先增加再减小的变化趋势,当OPS掺量为2%~3%时达到峰值.抗拉强度与OPS含量呈线性关系,随干密度增加,抗拉强度先增加再减小,当干密度为1.5 g/cm3时,抗拉强度达到最大值70.38 kPa.OPS溶液在砂土中形成的高分子膜紧密地缠绕、包裹砂粒,填充砂土空隙,形成稳定的网络状结构,进而增强土颗粒间的相互作用,改善砂土的工程特性.To study the effects of organic polymer stabilizer (OPS) on sand reinforcement, permeability, unconfined compression, quick shear and tensile tests were carried out. The effects of the OPS content and the dry density on reinforcement effectiveness were studied, and the mechanism of OPS reinforced sand was analyzed by using the micro-scanning electron microscope. The results show that with the increase of the OPS content and the dry density, the permeability coefficient of reinforced sand decreases while the relative permeability resistance coefficient, the compression strength, the residual strength, and the cohesion of reinforced sand increase. The internal friction angle increases first and then decreases with the increase of the OPS content. When the OPS content is 2% to 3%, the internal friction angle reaches maximum. The relationship between the tensile strength and the OPS content is linear. With the increase of the dry density, the tensile strength increases first and then decreases. The tensile strength reaches the maximum of 70.38 kPa with the dry density of 1.5 g/cm^3. The polymer membrane formed by OPS solution enwraps sand particles, and fills void to form a stable net structure among sand particles. The interaction among sad particles is enhanced, and the engineering properties of sand are improved.

关 键 词：有机高分子固化剂 砂土 渗透特性 强度特性 改良机理 

分 类 号：TU443[建筑科学—岩土工程]